Moved server mods uploading by hosts into connect_to_game
Moved server mods uploading by hosts into connect_to_game

- added needsServerModsUpload for hosts starting a game or joining a
waiting custom server
- added serverModsUploading while uploading and remounting server mods
- changed server_state handler to upload server mods if needed before
redirecting to new_game
- added mount_mod_file_data handler to remount server mods once
uploaded then redirect to new_game

UberEnt/pa-ui,UberEnt/pa-ui